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Which set of numbers do 4 belong to?
4 belongs to any set that contains it. So {1, pi, 4, -37.5689, sqrt(2)} is a possible answer.
What set of numbers does 23.5 belong to?
To any set that contains it! It belongs to {23.5}, or {23.5, sqrt(2), pi, -3/7}, or all whole numbers between 13 and 53, or integer multiples of 0.5, or rational numbers, or real numbers, or complex numbers, etc.
Which set of numbers -60 not belong to?
Irrational numbers.
What subsets of the real numbers does the number 25.6 belong?
It belongs to the interval (25, 27.3), or [-20.9, 10*pi], and infinitely more such intervals.It also belongs to the set of rational numbers, real numbers, complex numbers and quaternions.
What set of numbers does 1.18 belong?
To any set that contains it! It belongs to {1.18}, or {45, sqrt(2), pi, 1.18, -3/7}, or all numbers between -2 and 453, or improper fractions (1.18 = 19/50], or rational numbers, or real numbers, or complex numbers, etc.
